Spark plug



Nov. 16,1926.

E. G. HANTSCH SPARK PLUG Filed Oct. 18, 1924 Patented Nov. 16, 1926.

EDWIN G. HANTSCH, OF BINGHAMTON, NEW YORK,

ASSIGNOR TO INTERNATIONAL SPARK PLUG CORPORATION, A CORPORATION OF NEW YORK.

SPARK PLUG.

Application filed October 18, 1924. Serial No. 744,420.

The principal object of the present invention is the provision of a spark plug which is not susceptible to foul easily, thereby insuring a positive spark and obviating I misfiring and the objectionable features incident thereto, the plug including a variable spark gap which is of some appreciable length and tapering from one end to the other so that firing is assured low speed, the spark passing at the smaller end of tie spark gap, and approaching the larger end of the gap as the speed of the engine increases.

Other objects and advantages will be parent and suggest themselves as the nature of the invention is understood.

While the drawings illustrate an embodiment of the invention it is to be understood that in adapting the same to meet diiierent conditions and requirements,various chang s in the form, proportion, and minor details of construction may be resorted to without departing from the nature of the invention.

Referring to the accompanying drawings forming a part of the specification,

Figure 1 is a side View of a spark embodying the invention,

Figure 2 is a central sectional view of the plug on the line 2-2 of Figure l,

Figure 3 is a view of the plug as seen from the lower end,

Figure 4 is a detail sectional view of the electrodes, and

Figure 5 is an enlarged elevational view of the electrodes showing more clearly the variable or tapering spark gap.

Corresponding and like parts are referred to in the following description and designated in the several views of the drawings by like reference characters.

The numeral 1 denotes the body or shell of the plug and 2 the nut threaded into an end thereof. The central elect-rode 3 is threaded at its upper end to receive the usual binding nut 4 and terminal 5. This electrode tapers at its lower end in which is formed an opening 6 to receive the stern of a terminal 7 which is spread to provide a straight edge 8 which may be of any determinate length and beveled from opposite sides to a knife edge as indicated most clearly in Figure 4. The ground electrode 9 is preferably formed with the body or shell 1 and spans the opening of the shell n at J- plug retain the electrode 3 and is connected at opposite ends thereto whereby to provide a guard to prevent particles of soot or carbon from lodging in the spark gap 10 formed between the edges of the electrodes. The bridging or horizontal portion of the electrode 9 is beveled upon opposite sides to a knife edge as shown most clearly in Figure 4, the spark gap 10 bei formed between the knife edges of the electrodes and tapering throughout its length as shown most clearly in Figure 5, said gap being narrow at one end and wide at the op posite end, with the result that when the engine is running at low speed, the spark occurs at the narrow end of the and proaches the wider end as the speed of tl 3 engine increases.

A winding 11 of mica or other suitable material encloses the electrode 3 and arsumes a tapering form by reason of the taper of the electrodes and as result the said electrode 8 with the insulating wi= may be pressed into the opening of the nut 2, which is preferably of tapering form to secure the part by a wedging action. bonnet 12 of porcelain or other insulati material encloses the upper projecting por tion of the winding 11 andis held in piare by the binding nut 4 which also serves to in place witlin the nut WVhat is claimed is 1. A spark plug having a central electrode and a bridging electrode, the latter being substantially triangular in cross section with one of its edges uppermost, said bridgin electrode extending across the opening of the shell or body of the plug and rating as a guard to prevent particles of soot or carbon lodg 1g in the spark gap.

2. A spark plug comprising ashell having an electrode bridging the opening thereof at the lower end, the horizontal portion of said electrode being beveled to provide a straight knife edge at the upper extremity and a relatively wide lower extremity, and a. central electrode extended laterally and beveled to provide a straight knife edge, the

spark gap formed between the knife edges of the two electrodes tapering throughout its length and made narrow at one end and wide at the opposite end. 7 In testimony whereof I affix my signature.

EDWIN G. HANTSCH.

ling ll 

